1. Go to your developer console https://console.cloud.google.com/apis/credentials/consent 
  2. Go to OAuth consent screen
  3. Go to +Add users, under test users
  4. Add the users for the test (even the owner’s email address if not working without it)

Reference:

https://developers.google.com/google-ads/api/docs/oauth/playground

Using OAuth 2.0 for Web Server Applications  |  Google Identity  |  Google Developers

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